Findings released this week from three years of studies by neuroscientists and psychologists at seven universities help amplify scientists' understanding of how training in the arts might contribute to improving the general thinking skills of children and adults. The idea that the arts, and music in particular, could make children smarter in other ways gained currency in the 1990s, after a pair of researchers published a study showing that college students performed better on some mathematical tests after listening to a 10-minute Mozart sonata. The news led to some widely reported, if fleeting, efforts to promote music learning. Georgia legislators, in fact, even voted to provide parents of newborns with tapes of classical music. But most neuroscientists viewed such policy moves as premature: The studies never definitively determined whether exposure to music, or other arts, causes changes in the brain that sharpen other kinds of thinking skills. Left unsettled, experts say, is whether the arts make people smarter or whether smart people simply gravitate to the arts.